Added boost header

test/external/boost/date_time/time_parsing.hpp

@@ -0,0 +1,321 @@
+#ifndef _DATE_TIME_TIME_PARSING_HPP___
+#define _DATE_TIME_TIME_PARSING_HPP___
+
+/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the 
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $
+ */
+
+#include "boost/tokenizer.hpp"
+#include "boost/lexical_cast.hpp"
+#include "boost/date_time/date_parsing.hpp"
+#include "boost/cstdint.hpp"
+#include <iostream>
+
+namespace boost {
+namespace date_time {
+
+  //! computes exponential math like 2^8 => 256, only works with positive integers
+  //Not general purpose, but needed b/c std::pow is not available 
+  //everywehere. Hasn't been tested with negatives and zeros
+  template<class int_type>
+  inline
+  int_type power(int_type base, int_type exponent)
+  {
+    int_type result = 1;
+    for(int i = 0; i < exponent; ++i){
+      result *= base;
+    }
+    return result;
+  }
+  
+  //! Creates a time_duration object from a delimited string
+  /*! Expected format for string is "[-]h[h][:mm][:ss][.fff]".
+   * If the number of fractional digits provided is greater than the 
+   * precision of the time duration type then the extra digits are 
+   * truncated.
+   *
+   * A negative duration will be created if the first character in
+   * string is a '-', all other '-' will be treated as delimiters.
+   * Accepted delimiters are "-:,.". 
+   */
+  template<class time_duration, class char_type>
+  inline
+  time_duration
+  str_from_delimited_time_duration(const std::basic_string<char_type>& s)
+  {
+    unsigned short min=0, sec =0;
+    int hour =0; 
+    bool is_neg = (s.at(0) == '-');
+    boost::int64_t fs=0;
+    int pos = 0;
+      
+    typedef typename std::basic_string<char_type>::traits_type traits_type;
+    typedef boost::char_separator<char_type, traits_type> char_separator_type;
+    typedef boost::tokenizer<char_separator_type,
+                             typename std::basic_string<char_type>::const_iterator,
+                             std::basic_string<char_type> > tokenizer;
+    typedef typename boost::tokenizer<char_separator_type,
+                             typename std::basic_string<char_type>::const_iterator,
+                             typename std::basic_string<char_type> >::iterator tokenizer_iterator;
+   
+    char_type sep_chars[5] = {'-',':',',','.'};
+    char_separator_type sep(sep_chars);
+    tokenizer tok(s,sep);
+    for(tokenizer_iterator beg=tok.begin(); beg!=tok.end();++beg){
+      switch(pos) {
+      case 0: {
+        hour = boost::lexical_cast<int>(*beg);
+        break;
+      }
+      case 1: {
+        min = boost::lexical_cast<unsigned short>(*beg);
+        break;
+      }
+      case 2: {
+        sec = boost::lexical_cast<unsigned short>(*beg);
+        break;
+      };
+      case 3: {
+        int digits = static_cast<int>(beg->length());
+        //Works around a bug in MSVC 6 library that does not support
+        //operator>> thus meaning lexical_cast will fail to compile.
+#if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
+        // msvc wouldn't compile 'time_duration::num_fractional_digits()' 
+        // (required template argument list) as a workaround a temp 
+        // time_duration object was used
+        time_duration td(hour,min,sec,fs);
+        int precision = td.num_fractional_digits();
+        // _atoi64 is an MS specific function
+        if(digits >= precision) {
+          // drop excess digits
+          fs = _atoi64(beg->substr(0, precision).c_str());
+        }
+        else {
+          fs = _atoi64(beg->c_str());
+        }
+#else
+        int precision = time_duration::num_fractional_digits();
+        if(digits >= precision) {
+          // drop excess digits
+          fs = boost::lexical_cast<boost::int64_t>(beg->substr(0, precision));
+        }
+        else {
+          fs = boost::lexical_cast<boost::int64_t>(*beg);
+        }
+#endif
+        if(digits < precision){
+          // trailing zeros get dropped from the string, 
+          // "1:01:01.1" would yield .000001 instead of .100000
+          // the power() compensates for the missing decimal places
+          fs *= power(10, precision - digits); 
+        }
+        
+        break;
+      }
+      }//switch
+      pos++;
+    }
+    if(is_neg) {
+      return -time_duration(hour, min, sec, fs);
+    }
+    else {
+      return time_duration(hour, min, sec, fs);
+    }
+  }
+  
+  //! Creates a time_duration object from a delimited string
+  /*! Expected format for string is "[-]h[h][:mm][:ss][.fff]".
+   * If the number of fractional digits provided is greater than the 
+   * precision of the time duration type then the extra digits are 
+   * truncated.
+   *
+   * A negative duration will be created if the first character in
+   * string is a '-', all other '-' will be treated as delimiters.
+   * Accepted delimiters are "-:,.". 
+   */
+  template<class time_duration>
+  inline
+  time_duration
+  parse_delimited_time_duration(const std::string& s)
+  {
+    return str_from_delimited_time_duration<time_duration,char>(s);
+  }
+
+  //! Utility function to split appart string
+  inline
+  bool 
+  split(const std::string& s,
+        char sep,
+        std::string& first,
+        std::string& second)
+  {
+    int sep_pos = static_cast<int>(s.find(sep));
+    first = s.substr(0,sep_pos);
+    second = s.substr(sep_pos+1);
+    return true;
+  }
+
+
+  template<class time_type>
+  inline
+  time_type
+  parse_delimited_time(const std::string& s, char sep)
+  {
+    typedef typename time_type::time_duration_type time_duration;
+    typedef typename time_type::date_type date_type;
+
+    //split date/time on a unique delimiter char such as ' ' or 'T'
+    std::string date_string, tod_string;
+    split(s, sep, date_string, tod_string);
+    //call parse_date with first string
+    date_type d = parse_date<date_type>(date_string);
+    //call parse_time_duration with remaining string
+    time_duration td = parse_delimited_time_duration<time_duration>(tod_string);
+    //construct a time
+    return time_type(d, td);
+
+  }
+
+  //! Parse time duration part of an iso time of form: [-]hhmmss[.fff...] (eg: 120259.123 is 12 hours, 2 min, 59 seconds, 123000 microseconds)
+  template<class time_duration>
+  inline
+  time_duration
+  parse_undelimited_time_duration(const std::string& s)
+  {
+    int precision = 0;
+    {
+      // msvc wouldn't compile 'time_duration::num_fractional_digits()' 
+      // (required template argument list) as a workaround, a temp 
+      // time_duration object was used
+      time_duration tmp(0,0,0,1);
+      precision = tmp.num_fractional_digits();
+    }
+    // 'precision+1' is so we grab all digits, plus the decimal
+    int offsets[] = {2,2,2, precision+1};
+    int pos = 0, sign = 0;
+    int hours = 0;
+    short min=0, sec=0;
+    boost::int64_t fs=0;
+    // increment one position if the string was "signed"
+    if(s.at(sign) == '-')
+    {
+      ++sign;
+    }
+    // stlport choked when passing s.substr() to tokenizer
+    // using a new string fixed the error
+    std::string remain = s.substr(sign);
+    /* We do not want the offset_separator to wrap the offsets, we 
+     * will never want to  process more than: 
+     * 2 char, 2 char, 2 char, frac_sec length.
+     * We *do* want the offset_separator to give us a partial for the
+     * last characters if there were not enough provided in the input string. */
+    bool wrap_off = false;
+    bool ret_part = true;
+    boost::offset_separator osf(offsets, offsets+4, wrap_off, ret_part); 
+    typedef boost::tokenizer<boost::offset_separator,
+                             std::basic_string<char>::const_iterator,
+                             std::basic_string<char> > tokenizer;
+    typedef boost::tokenizer<boost::offset_separator,
+                             std::basic_string<char>::const_iterator,
+                             std::basic_string<char> >::iterator tokenizer_iterator;
+    tokenizer tok(remain, osf);
+    for(tokenizer_iterator ti=tok.begin(); ti!=tok.end();++ti){
+      switch(pos) {
+        case 0: 
+          {
+            hours = boost::lexical_cast<int>(*ti); 
+            break;
+          }
+        case 1: 
+          {
+            min = boost::lexical_cast<short>(*ti); 
+            break;
+          }
+        case 2: 
+          {
+            sec = boost::lexical_cast<short>(*ti); 
+            break;
+          }
+        case 3:
+          {
+            std::string char_digits(ti->substr(1)); // digits w/no decimal
+            int digits = static_cast<int>(char_digits.length());
+            
+            //Works around a bug in MSVC 6 library that does not support
+            //operator>> thus meaning lexical_cast will fail to compile.
+#if (defined(BOOST_MSVC) && (_MSC_VER <= 1200))  // 1200 == VC++ 6.0
+            // _atoi64 is an MS specific function
+            if(digits >= precision) {
+              // drop excess digits
+              fs = _atoi64(char_digits.substr(0, precision).c_str());
+            }
+            else if(digits == 0) {
+              fs = 0; // just in case _atoi64 doesn't like an empty string
+            }
+            else {
+              fs = _atoi64(char_digits.c_str());
+            }
+#else
+            if(digits >= precision) {
+              // drop excess digits
+              fs = boost::lexical_cast<boost::int64_t>(char_digits.substr(0, precision));
+            }
+            else if(digits == 0) {
+              fs = 0; // lexical_cast doesn't like empty strings
+            }
+            else {
+              fs = boost::lexical_cast<boost::int64_t>(char_digits);
+            }
+#endif
+            if(digits < precision){
+              // trailing zeros get dropped from the string, 
+              // "1:01:01.1" would yield .000001 instead of .100000
+              // the power() compensates for the missing decimal places
+              fs *= power(10, precision - digits); 
+            }
+            
+            break;
+          }
+      };
+      pos++;
+    }
+    if(sign) {
+      return -time_duration(hours, min, sec, fs);
+    }
+    else {
+      return time_duration(hours, min, sec, fs);
+    }
+  }
+
+  //! Parse time string of form YYYYMMDDThhmmss where T is delimeter between date and time
+  template<class time_type>
+  inline
+  time_type
+  parse_iso_time(const std::string& s, char sep)
+  {
+    typedef typename time_type::time_duration_type time_duration;
+    typedef typename time_type::date_type date_type;
+
+    //split date/time on a unique delimiter char such as ' ' or 'T'
+    std::string date_string, tod_string;
+    split(s, sep, date_string, tod_string);
+    //call parse_date with first string
+    date_type d = parse_undelimited_date<date_type>(date_string);
+    //call parse_time_duration with remaining string
+    time_duration td = parse_undelimited_time_duration<time_duration>(tod_string);
+    //construct a time
+    return time_type(d, td);
+  }
+
+
+
+} }//namespace date_time
+
+
+
+
+#endif